Furnace.



No. 723,663. v PATENTED MAR. 24, 1903.

E. A. FIELD & J. LYNN.

FURNACE.

APPLICATION FILED 001'. 2a. 1901.

N0 MODEL.

Aims/10123 Attorneys.

UNITED, STATES 'ATENT FFICE.

EDWARD A. FIELD AND JAMES LYNN, OF DETROIT, MICHIGAN; SAID FIELDASSIGNOR TO SAID LYNN.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 723,663, dated March24, 1903.

Application filed October 28, 1901. Serial No. 80,200- (No models ToaZZwhom it vma /y concern:

Be it known that we, EDWARD A. FIELD and JAMES LYNN, citizen of theUnited States, residing at Detroit, county of Wayne, State of Michigan,have invented a certain new and useful Improvement in Furnaces; and wedeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification.

Our invention relates to furnaces; and the object of our improvements isto secure the complete combustion of the inflammable gases given off bythe fuel and to prevent the discharge of smoke. We attain this object inthe apparatus shown in the accompanying drawings, in which Figure 1 is aside elevation of part of a steam-boiler and a section of the furnacethereunder. Fig. 2 is a detail perspective view of the superstructureupon thef'bridgewall. Fig. 3 is a section on the line 3 3 of Fig. 2, thecommencement of the brickwork, which is built up to close the passagebetween furnace and the stack except through the apertures through thesuperstructure in the bridge-wall, being also shown.

A is the boiler; B, the furnace; C, the bridge-wall; D, the opening forthe admission of fuel and air above the fire, and d a valve or dooradapted to close the opening D and adjustable so as to let more or lessair flow into the furnace above the grate.

Upon the top of the bridge-wall we erect a superstructure of fire-brickconsisting of parallel rows, the constituent bricks a a of which arelaid end to end and upon one of their longer edges. These rows are adistance apart from center to center about equal to the length of abrick. Upon the top of these bricks a a we lay bricks b 1), extendinglaterally to the bricks a a and lying upon one of their broader faces.The bricks b I) lie in rows extending across the furnace, and the rowsare a distance apart equal to perhaps half the width of a brick, the rowadjacent to the furnace extending partly over the'end of the brick andbeneath it. Upon the bricks b b are placed a third row of bricks a a,similar and similarly located to the bricks a a. The brick a, which aretoward the furnace, overhang the brick b, upon which they rest. Upon thebricks a a we place other bricks b 1), forming rows similar to those ofthe bricks b b, the row upon the furnace side overhanging the bricks or,upon whichthey rest. In this way we build up to within perhaps four orfive inches of the boiler. We then fill in the remaining space withbricks laid in the usual way and fill in the space around theboiler'with ordinary brickwork, so thatfthere is no passage between thefurnace and stack except through the passage-way between the bricks a ab b.

It will be noticed that the method of laying the bricks a a b 6 leaveshorizontal direct passages between the furnace and the space of thebridge-wall and that these passages communicate with each other by bothvertically and horizontally expanding passages. be also noted that thebricks b b overlapping the underlying bricks have an effect to break upthe currents of gases and thoroughly mix them.

In practice the bricks a a I) I) become whitehot, so that they willignite inflammable gases that enter them. The valve (1 is slightlyopened, so as to admit the proper quantity of air. The air andinflammable gases are mixed and togetherenter' the passage between thebricks a, a b b, and the latter are ignited by contact with said bricks,the vertical passages permitting the gases to expand on ignition intopassages bounded by white-hot walls, so that the combustion is verycomplete.

It will' The expansion of the gases on ignition within the passagesamong the bricks a a b 1) still further mixes the gases, so that ifsufficient air is admitted to burn the gases the air and gases are sureto be brought into intimate contact.

The formation of the superstructure upon the bridge-wall that is towardthe fines presents a large radiating-surface by which heat is radiatedto the boiler back of said'bridgewall.

What we claim is 1. In afurnace,the combination of abridgewall,a systemof parallel rows of bricks resting upon theiredges, extending from thefront toward the back of said bridge-wall on the ICO upon their edges,extending from the front toward the back of said bridge-wall on the topthereof, said rows being spaced from each other, a second system ofparallel rows of bricks lying upon their sides upon the firstmentionedbricks and extending transversely thereof, said last mentioned rowsbeing spaced from each other, the'row toward the furnace overhanging thebricksupon which it rests, and the row toward the stack being spacedfrom the end of the bricks upon which it rests, and a third system ofparallel rows of bricks resting upon the second system, their furnaceends extending over the bricks upon which they rest, and their otherends being spaced from the edges of the bricks upon which they rest.

In testimony whereof we sign this specification in the presence ofwitnesses.

EDWARD A. FIELD. 4 JAMES LYNN, Witnesses for Edward A. Field:

LOTTA L. HAYTON, ELLIOTT J STODDARD. Witnesses for James Lynn:

0. 0. JENNINGS, ELLIOTT J. S'IODDARD.

